package collection;

import java.awt.geom.PathIterator;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;

public class CollectionDemo {
    public static void main(String[] args) {




        Collection c=new ArrayList();
        c.add(new Point(1,2));
        c.add(new Point(3,4));
        c.add(new Point(5,6));
        c.add(new Point(7,8));
        c.add(new Point(9,0));
        c.add(new Point(1,2));
        System.out.println(c);

        /*
        boolean contains(Object o);
        判断当前集合是否包含给定元素o
        判断依据是给定元素是否与当前集合存在equals()比较为true的情况
        需要重写equals

         */

        Point p=new Point(1,2);
        boolean contains = c.contains(p);
        System.out.println("是否包含："+contains);


        /*
        boolean remove(Object o )----一般都不接受boolean结果
        从当前集合中删除与给定元素o的equals()比较为true的元素
        若存在重复元素则只删除一次
         */
        c.remove(p);
        System.out.println(c);
        c.remove(p);
        System.out.println(c);
        c.remove(p);
        System.out.println(c);

        //集合中存放的元素的引用
        Collection cc=new ArrayList();
        Point pp= new Point(1,2);
        cc.add(pp);  // 将pp添加到cc中------将pp的引用装到了cc中
        System.out.println("pp:"+pp);
        System.out.println("cc"+cc);

        pp.setX(100);
        System.out.println("pp:"+pp);
        System.out.println("cc"+cc);














        /*
        Collection c=new ArrayList();
        c.add("one");
        c.add("two");
        c.add("three");
        c.add("four");
        c.add("five");
        //集合重写Object的toString()方法，返回格式如下
        //[元素1.toString(),元素2.toString(),元素3.toString(),...]
        System.out.println(c);
        System.out.println("是否为空集"+c.isEmpty());
        c.clear();
        System.out.println("集合已清空");
        System.out.println(c);
        System.out.println("size:"+c.size());
        System.out.println("是否为空集"+c.isEmpty());




        Collection c1=new ArrayList();
        c1.add("aaa");
        c1.add("bbb");
        c1.add("ccc");
        c1.add("ddd");
        c1.add("eee");
        boolean b1 = c1.add("aaa"); //可重复
        System.out.println(b1);
        System.out.println(c1);

        Collection c2=new HashSet();
        c2.add("aaa");
        c2.add("zzz");
        c2.add("eee");
        c2.add("ddd");
        c2.add("ccc");
        boolean b2 = c2.add("aaa");//不可重复
        System.out.println(b2);
        System.out.println(c2);


         */
    }
}
